ML17174A603
| ML17174A603 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities  |
| Issue date: | 12/02/1980 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Abel J COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8012190657 | |
| Download: ML17174A603 (4) | |
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- Docket Nos.: 50-237/249 50-254/265
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SUBJECT:
CONTAINMENT PURGE AND VEtir VALVE OPERABILITY
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- p (DRESDEN STATION, UNITS. 2 and 3 ANO* QUAD CITIES STATION, UNITS. 1 and 2) we-are continuing our r~view of
- your report entitled 11Eva1Uatiori of 18.Q - Inch Containment Isolation Valves for Dresden Station., *units 2 and 3 and Quad Cities, Units 1 and 2~
11 submitted by l~tter dated_
- Augu.st 22, 1980~ <Before we *can complete our review, the additional information described in the enclosure to this. letter is'. needed.
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Enclosure£ Request for Additional Information
- *cc w/enclosure:
- " See next page NRC FORM 318 (9-76) NRCM 0240 Sincerely~
G. c. Lainas, Assistant.Director
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e UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 Docket Nos.: 50-237/249 50-254/265 Mr. J. S. Abel Director of Nuclear Licensing Corrunonwealth Edison Company Post Office Box 767 Chicago, IL 60690
Dear Mr. Abel:
OEC 2 1980
SUBJECT:
CONTAINMENT PURGE AND VENT VALVE OPERABILITY (DRESDEN STATION, UNITS 2 and 3 AND QUAD CITIES STATION, UNITS l and 2)
We are continuing our review of your report entitled "Evaluation of 18.0 - Inch Containment Isolation Valves for Dresden Station, Units 2 and 3 and Quad Cities, Units l and 2," submitted by letter dated August 22, 1980.
Before we can complete our review, the additional information descri"bed in the enclosure to this letter is needed.
Enclosure:
Request for Additional Information cc w/enclosure:
See next page Sincerely,
<2.f.y'~
~G.. C. Lainas, Assistant Director for Safety Assessment Division of Licensing
Mr. J. s. Abel cc Isham, Lincoln & Beale Counselors at Law One First National Plaza, 42nd Floor Chicago, Illinois 60603 Mr. B. B. Stephenson Plant Superintendent Dresden Nuclear Power Station Rura 1 Route #1 Morris, Illinois 60450 Natural Resources Defense Council 917 15th Street, N. w.
Washington, O. c. 20005 U. S. Nuclear Regulatory Conmission Resident Inspectors Office Dresden Station RR #1 Morris, Illinois 60450 Susan N. Sekuler Assistant Attorney General Environmental Control Division 188 w. Randolph Street Suite 2315 Chicago, Illinois 60601 Morris Public Library 604 Li be*rty Street Morris, Illinois 60451 Chairman Board of Supervisors of Grundy County Grundy County Courthouse Morris, Illinois 60450 John F. Wolfe, Esquire 3409 Shepherd Street Chevy Chase, Maryland 20015 Dr. Linda w. Little 500 Hermitage Drive Raleigh, North Carolina 27612 Department of Public Health ATTN:
Chief, Division of Nuclear Safety 535 West Jefferson Springfield, Illinois 62761 Director, Standards and Criteria Divis ion Office of Radiation Programs
{ANR-460)
- u. s. Environmental Protection Agency Washington, D~ C.
20460 U. s. Environmental Protection Agency Federal Activities Branch Region V Office ATTN:
EIS COORDINATOR 230 South Dearborn Street Chicago, Illinois 60604 Dr. Forrest J. Remick 305 East Hamilton Avenue State College, Pennsylvania 16801 R. E. Schaffstall; Executive Director for SEP Owners Group 1747 Pennsylvania Avenue, NW Washington, D.C.
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REQUEST FOR ADDITIONAL INFORMATION QUAD CITIES 1&2 AND DRESDEN 2&3 CONTAINMENT PURGE/VENT VALVES 1.0 18.0 Inch Butterfly Valve~
1.1 Describe how each of the valve installations, relative to the piping con-figurations, have been reviewed to assure that the dvMmic toro11P. coef-ficients (Ct) developed by Flu~d dynamtc testi*ng are applicable to the*
Dresden & Quad Cities valve~. Ct can be affected uy shaft orientation relative to close proximity.-Qf upstream elbows and disc closure direction relative to these close proximity upstream elbows.
1.2 Do the operators have maximum torque rating(sJ as established by the manufacturer?
How does it compare to the maximum torque developed dur-
- ing the accfdent postulated? Does combined loading of spring and dynamic torque affect any parts of the operator to the extent that they become the limiting factor?
1.3 Describe the extent to which the valve assembly (valve and operator) is seismically qualified?
1.4 Describe the extent to which the pilot solenoid valves are seismically qualified and environmentally qualified for long tenn exposure to the
-normal plant environment.
Do the elastomeric parts, solenoids, etc have
. a qualified design life where periodic replacement of parts is required?
1.5 Describe the extent to which the operators are seismically qualified and environmentally qualified for long tenn exposure to the nonnal plant*
environment.
Do the elastomeric parts in the *operator have a qualified design life where periodic replacement is required?
1.6 Do the elastomeric parts.in the valve body have a qualified design life?
Are they required to be replaced periodically? Describe what inservice testing/inspections are accomplished to check the integrity of the: seals.
1.7 Has the stress analysis been reviewed by H. Pratt?
1.8 Provide an assessment of the structural capability of any ducting or piping in the purge system which is upstream or downstream of the valves and is exposed to the flow condition associated with the LOCA and the seismic
- event. The staff is particularly interested in the effects that loose,*
debris from the pipe or duct system may have on the closure capability of these valves.
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